Circuit-breaker.



W. M. SCOTT.

CIRCUIT BREAKER.

- nrmonron rmm KAY 25. 1a1q.

Patented July 11, 1911.

2 SHEETS-SHEET 1.

Fig.1.

, mwbu WITNI88I8 ATTORVEY W. 1111. SCOTT.

CIRCUIT BREAKER.

APPLIOATIOE IILIJ D MAY 25, 1910.

' 997,332. Patented July 11,1911

2 SHEETS-SHEET 2.

INVINTOR 4 ATTORNEY WILLIAM M. SCOTT, 0F PHILADELPHIA, PENNSYLVANIA.

CIRCUIT-BREAKER.

Specification of Letters Patent.

Patented July 11, 1911.

Application filed May 25 1910. Serial No. 563,366.

To all whom it may concern:

Be it known that l, \Vnmrau M. Scorr, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a new and useful Circuit-Breaker, of which the following is a s )ecification,

My invention relates to electric switches for controlling circuits carrying either direct or alternating currents, and in" pa ticularly to an electrically controlled or actuated switch or circuit breaker which shall interrupt or otherwise control a circuit.

Iy invention resides in a new form of electric switch or circuit breaker of the type which cannot be brought to or locked in circuit closing or other normal position duriu the continuance or existence ofan abnorma electrical condition; and my invention may be termed a new ty e of non-closable switch or circuit biea er.

My invention resides in a non-closable switch or circuit breaker which is sensitively or delicately locked, thou 11 none the lessfirmly and securely locke a dog or compression latch being used for this purpose.

I have found that the employment of such a do in a non-closable switch or circuit breafier such as illustrated, or the'equivalent thereof, renders the same when locked secure against accidental or undesired release, and yet so sensitive as to respond with utmost certainty and quickness to desired electrical controls.

For an illustration of one of theforms my invention may take, reference is to be had to the accompanying drawings, in which:

. Figure 1 is a side elevational view of my improvedswitch or circuit breaker. .Fig. 2 is a fragmentary view, in side elevation, and on larger scale, of-tlie control parts when the switcher circuit breaker is in open 051-- tion. Fig. 3 is a side elevational view o the operating ,member for the movable contact member, a part of the do actuator be ng broken away. F ig. 4* is a ragmentary view at right angles to Fig, 3 showingthe two lockingrollers. Fig. 5 is a side view of a member of the tripping mechanism, Fig. 6 is a side view ofa-latch. Fig. 7 is a side 1 view of a memberof the tripping mechanisin. Fig; 8 is a side viewof the dog actuator. lfllg. 0 is a side view of the; dog.- Fig. -10 'is'a fragmentary viewillustrat ng modified operating means. Fig. 11 is a fragmentary view, in'end elevation, of parts of the tripping and control mechanism.

Referrin to the drawings, 1 is any suitable base 0 insulatin material, such as slate or marble, and may fie a switchboard, upon which are secured the main terminal blocks 2 and 3 with which communicate the conducting studs 4 and 5, respectively, extending through the base or switchboard 1, nuts 6 eing provided as usual. The laminated contact member 7 isadaptcd to bridge the main contacts 2 and 3 to close the circuit.

The main movable contact 7 is secured upon the arm 8 pivoted to the bracket or housing 9 at 10.

Mounted upon the upper main terminal block 2 and in electrical communication therewith is the metallic shunt contact 11 with which coo crates the movable metallic shunt contact 1 -'su orted upon the arm 8. And above the meta ic shunt contact 11 and in electrical communicationwith the terminal block 2 is; the stationary carbon'shunt contact 13 pivoted to the bracket 14 at 15. Cooperating I with the stationary carbon shuntkcontact 13 is the movable carbon shunt contact 16 carried by the arm 8, the contacts 12and 16 being in erin'anent electrical communication with t e lower main contact 3 through the flexible conductor 17.

Pivoted at 18 upon thearm 8 is the roller 19 engaged by the cam surface 20 upon the switch operating member 21 pivoted to the bracket or housing at 22 and aving the exof the bracket or housingt). A spring 27 tension 23. Theactuatpgfl is pivoted at 22 is connected at its one end at 28 to the operating member 21 and at its other end at 29 to.the pivoted arm 8, and -.when the parts are in' circuit closing position the spring 27 is'under tension.

"Carried by the operatin member '23 are two rollers 30 and 31. ith the roller 31 is adapted to engage the latch 32 pivoted at 33 on a lug or ear 34 upon the bracket or housin 9. tension spring 44 connected to latch 3-2 and to the housing 9 holds latch 32 raised, The latch 32 extends to the left beyond the pirot33 and has formed therein for limiting its movement the jaw 35 loosely embracing the pin 36 carried by the housing. Mounted upon the pivot 33 is the member 37 having a rearwardly extending tail 38 disposed in the path of travel of the member 3%) pivotedat 40 and carrying the armature 410i an electro-control magnet responsive to any desired current or circuit condition, but here shown, by way of example merely, as that of tlllOVfllOlltlJllllguct. livoted to the tall 38 is a rod 42 having the handle 43 for manually tripping the switch or breaker. A second tension spring 14 is connected at one end to the bracket or housing 9 11nd at its other end to the member 37 at a point to the right of the pivot 33. At its right hand end the member 217 carries th: adjustable screws45, 45 screw 45 adapted to strike upon the top 0 the latch 32 and screw 45 upon the top of the member--46 pivoted at 33 and having a rearward cxtcnslon provided with a aw 47, loosely embracing the pin 36, for limiting its movement. In the path of movement of the member 46 is disposed the tailed memher 43 pivoted at 49 on the operatin member 23 below the roller 30' "livotct at at) on the actuator 2-1 is the dog or compression latch 51 whose end is adapted to restaguiust the roller.3t)' at a point sli htly below astraight, line passing througi centers of roller 30 and pivot and above the projection 52 upon the member 48 to operati\cl v connect the actuator 24 and operating member 23. The dog actuator 48 is provided also with two stops at and '7), adapted to engage the roller 80. thus allowing the member 48 a certain amount of movement about the pivot it). the stop a limiting the movement in one direction. while the stop I) limits the movement in the other direction. The dog 51 has a projection 53 adapted to engage the stop or web 54 upon the actuator 21- to limit the counter clockwise movement of the dog 51. It also husa stop 55 adapted to clwago thc top of-the web 54 to limit its clotwise movement.

The ohcration .is as. follo\\s:-.\Yiththeatrts in clt'culhclosing position. as shown in l"ig.1,"thc do" 51 is in engagement with the roller i tliam'l the latch 32 i in cugagcment with roller 31 holding the iarts' locked in the position shown. hcn t teat-mature ll is attractcdiby the overload magnetron in response to any other prcdetcrmiued electrical condition in a circuit, the member 39 rotates about its pivot -l0 in a counterclockwise direction striking the under side of the tail 3S of'the member 37 rocking the same in opposition to spring 4t in a clockwise direction about its pivot 33 and causing a screw 45 at ,its outer end to strike upon the top of the member 46 rocking it in a clot-k wise direction about itapivot mtand causing it to strike the upper side ot the mcmbcl 48,rocking the same in a counter clockwise direction abbut its pivot 45) causing the lug 52 to raise the nose or rounded end of dog 51 from below and across the imaginary straight line joining the center of pivot 50 and the center of roller 30, thus unlocking the actuator 24 from the operating member 23. A screw 45 up on the member 37 strikes upon the top of latch 32 rockin it in opposition to its spring 44 in a cloc wise d1rec tion about its pivot 33 and disengaging it from roller 31. then these operations have taken place, the circuit breaker or switch is free to open, the sprin 27 contracting and rotating the cam mem r 21 in a counter clockwise direction about its pivot 22, the arm 8 then rotating in aclockwise direction about its pivotvlO. The main movable contact 7 then separates from the terminal blocks 2 and 3, thereafter the metallic shunt contact 12 se arates from metallic shunt contact 11, an finally shunt carbon-16 separates from shuntcarbon 13, the final arc taking placeat. these carbons. The parts continue their opening movement'nntil they reach the position shown in Fig. .2, where the actuator 24 is disconnected .from the operating member 23, and the operating mem-' b91323 is also unlatchcd from the latch 32 carried by the frame or base. The actuator 24 has remained in the same position'during the'opcning movement, the operating member Jll'bcing first disconnected from the actuator 24 by actuation of the do 51, and immediately thereafter or simultaneously the latch 32 has unlocked theoperating mcmber'23 from the base.

To close the. switch or circuitbreaker, the

Iopcrator lifts the actuator 24 by handle 25,

rotating tho same in a counter cltmkwise direction about the pivot 22. In so doing the dog 51 will rotate in a counter clockwise direction about its pivot 50 and its end will engage back of the roller 30 and rest againstthe lug 52. the stop I; of member 48 engaging the side of the roller 30. With the parts ll] lllis'position thc'actuator 2t and operating member 23 are again opcrativelv couucctcd and the operator ('lc'presses the handle 23. ca'rr \'iug the actuator 2tand operating member 22-3 in a clockwise direction aboutpivot 22. causing the cam surface to press against the roller 1%) upon the pivoted arm ts. forcing that arm and the parts carried thereby towardthe stationary contacts. First. the carbons 1t) and 13 engage, thereal'lcrthc metallic shunt contact 12 engages metallic shunt contact 11. and finally. the

, bridging member 7 engages main contacts 2 and 3, thus fully closing the circuit. When the parts have reached this position the latch 32 engages rollerlzll and locks the n n-rsin the position shown in Fig. .1. Ti. however. during the closing movement above dwcrllaal. the abnormal electrical condition crating member therefor, an actuator, a

still exists or obtains, the member 37 will be rotated at first closure of the circuit or will have remained rotated to such osition as to depress the member 46 into tlie path of travel of the member -18 as it approaches the position shown in Fig. 1 due to-thclosing movement. The member 48 will then en age the depressed member 46 with the rcstilt that the member 48 will be again rotated in a counter clockwise direction about its pivot 49, causing the lug 52 to shift the dog :31 beyond the roller 30,again unlocking the actuator 24: from the operating member 23, leaving the parts free to fly to open circuit position, inasmuch as the position had not been reached where latch 32 would engage roller 31. It is a parent, therefore, that on attempting to c ose the circuit breaker during the existence or continuance of a predetermined electrical condition, the parts will fly to o cn circuit position and the operator is rob cd of control, in cllcct preventing closure of the switch or breaker.

While I have shown a cam as an 0 crating means to shift the arm 8 lOWtll'tl circuit closing position, it is to be understood that a toggle may be cmploycd. as. for example, pivoting two togg 0 links together, one toggle link pivoted at .23 and the other to the arm as shown in Fig. 10.

What I claim is:

1. In an elcctric switch, the combination with a movable contact member, of an oprollcr on said operating member. a gravity controlled dog pivoted upon said actuator and adapted to engage said roller at a point slightly to one sit e of the line joining said pivot and the center of said roller. and means for shiftingraid dog across said line, said operating member moving said dog upon its pivot during the. opening movement of said switch.

2. In an clcctric switch. the coi'abination with a movable contact member, of anoperating mcmbcr thercfor, an actuator. a roller on said operating member. a dog pivoted upon said actuator and adapted to thrust against said roller. a dog actuator, and lugs on said do" actuator adapted to engage said roller to limit th e'movement of said dog actuator. i 5

It. ,In an electric switch. the combination with a movable contact member. of an oper-' ating member therefor, an actuator. a dog pivoted on said actuator and thrusting against said operating membcrto move said operating member with said 'a'ct'uator. and a dog actuating member upon said operating mcmhcr. f

4. In an electric. switch. the combination with a movable contactmember. of an operating member tlferct'onan actuator. a rollcr l upon and operating member, a. dog pivoted on said actuator and thrusting against said roller, and a dogactuating member pivoted on said operating member and adapted to disen age said dog from said roller.

5. 11 an electric switch, the combination with a movable contact member, of an operating member therefor, an actuator, a member having a rounded surface upon said operating member, actuator and thr'usting against said rounded surface, and a dog actuating member ivotedon said op'eratin member and a apted to disengage said dog from said rounded surface.

6. In an electric switch, the combination with a movable contact'member, of an operating member therefor, an actuator, a dog pivoted upon said actuator and thrusting against said operatin member, a dog actuatin member pivoted upon said operating mem er, and means for limiting the pivotal movement of said dog actuating member.

7. In an electric switch, the combination with a movable contact member, of an operating member therefor, an actuator, a roller on said operating member, a dog pivoted on said actuator and adapted to engage said roller, a dog actuating member pivoted upon said operating member, a projection on said dog actuating member for engaging said (log, and means for limiting the. ivotal movement of said dog actuating mem er.

8. In an electricswitch, the combination with a movable contact member, of an operating member therefor, an actuator, a roller on'sai'd operating member, a dog pivoted on said actuator and adapted toenga e said roller, means for l niting the pivota movement of said dog,'a dog actuating member pivoted upon said operating member, a procction on said dog actuating member for en gaginrv said dog. and means for limiting the PIVOtI t l movement of said dog actuating member.

t). In an electric switch, the combination with a movable contact member, of an operating member therefor, an actuator, a roller on saidoperating member, a dog pivoted upon said actuator and adapted to en age said roller at a'point slightly to "one Sit e of the line joining said pivot and center of said roller, 0. dog actuator --upon said operating member, means for reventing the movement of said do in one i irection beyond said position, an means for shifting said across said line.

10. In an electric switch, the combination wit-h a movable contact member, of an operating member therefor. an actuator. a dog pivotcd on said-actuator and engaging said operatingmember. a base. a latch locking said. operating member to said base. and

means on said operating member for actuating said dog.

11. In an electric switch. the combination ator upon sai with a movable contact member, of an operatmg member therefor, an actuator, a dog pivoted on said actuator and thrusting against said'o crating member, a do actuo crating member, a ase, a latch locking sai o crating member to said base and means or actuating said dog actuator and latch in succession.

12. In an electric switch, the combination with a movable contact membcr,'of an operating. member therefor, an actuator, a dog pivoted to said actuator and thrusting against said operating member, a do actu-- ator on said operating member, and fiigs on said dog adapted to engage. said actuator to limit the movement of said dog.

13. 'In an electric switch, the combination with a movable contact member, of an operating member therefor, an actuator, a. roller pivoted to said operating member, a latch pivoted to said actuator and roller, a latch actuator pivoted ti said operating member, and pro ections on said latch actuator adapted to en age said roller to limit the movement of saidlatch actuator.

14. In an electric switch, the combination with a movable contact member, of an operating member therefor, an actuator, a latch pivoted to =aid actuator and engagingsaid operating member, and. a latch actuating member upon said operating memb r.

15. In an clectric switch, the combination with a movable contact member, of an operating member therefor, an actuator, a latch pivoted to said actuator and engaging said operating member, a latch actuatingmember pivoted upon said operating member, a base.

and electro-rcs onsive means upon said base controlling said latch actuating inember.

16. In an electric switch, the combiiuni'on w ith a movable contact member, of an oper- -ntmg member therefor, an actuator, a projection on said operating member,,a dog pivoted on said actuator and thrusting against said pro'ection, and a dogactuating member mountc upon said operating memher, and lugs (in said dog actuating member adapted to engagesaid'projeetionto limit the movement of said dog actuating-member.

17. In an electric switclnthe combination with a inovable contact member, of an operating member therefor. anaetuator, a do; pivoted to said actuator and. having a round: ed and thrusting against said 0 verating membet. a base. a latch upon said' use engaging snltl operating member. and adog actuator on said operating member. v H

18. In an electric switch, the combination with a movable contact member. of an operating member therefor. an actuator, a roller upon said operating member. a dog pivoted to said actuator and havingu ronm thru-ting ngniust said rollcr a base. and .i latch upon said base engaging said operating member, said operating member moving cn aging said od end Q said dog upon its pivotduring the opening movement of said switch.

19., Inanelectric switch, the combination with a movable contact member, of an operating member therefor, an actuator, a do pivoted to said actuator and having a round ed end thrusting a ainst said operating -member, a base, a hoo latch upon said base engaging said operating member, and a dog actuator on said operating member.

2Q In an electric switch, the combination witl a movable contact member, offanoperupon said operating member, a dog pivoted to said actuator and thrusting against said roller, a base, a hook latch upon said base engaging said operating member, and a dog actuator on saic operating member.

21. In an electric switch, the combination with a pivoted arm, of a movable contact member carried thereby, a pivoted operating member for actmiting said pivoted' arm, an actuator pivoted independentl of said operating member, a roller upon 881d operat ing member, a do pivoted on said actuator and tln'usting-ngamst said roller, and a dog actuator on said operating memb r.

with.a pivoted arm, of a movable contact member carried thereby, a pivoted o erating mcmbcrfor actuating said pivote arm an actuator pivoted independently of said operating member, a rol or upon said operating member, a dog pivoted on said actuator and lia'ving a rounded end thrusting against said roller, a base, and a latch pivoted on said base and engaging said operating. u'iemher, said operating member moving said dog upon its pivot during the openin movement of said switl-h.

"1 3. In an electric switch, the combination with a movable contact member, of an oprollrr nis-aid operating member, a dog pivoted on said actuator and adapted to engage said roller, a dog actuating member. a proengagingsahl dog. and'lugs on said d a tunting member adapted to engage en t actuating member.

ll. in an electric switch. the combination with-a movable contact number. of an op 'crating,member therefor. an actuator, a

roller on said operating member. a dog on I'suul actuator engaging said roller, a dog actuating member upon said operating member, and means for preventing movement of I said d g in one direction past engaging po- ,.-.tition with .-':lltl roller.

95. 'ln an electric switch. the combination with .nmovable comm-t member, of an operating member iherct'or. an actuator. n dog pivoted to said actuator and thru ting against said operating member, a ting uvtuating member therefor, an actuator, a roller,

I 42. In an electric switch, the otn'bination jection on said dog actuating.member for.

roller to limit the movement of said dog erntimr member therefor.- an actuator, 11

ator pivoted on said operatin member, and means for limiting the pivotal movement of said dog actuator.

26. In an electric switch, the combination with a movable contact member, of an operating mem'ber therefor, an actuator, a roller upon said operating member, a dog pivoted to said actuator and thrusting against said roller, ado actuator on said operating member limiter in its movement by said roller, 11 base, a latch for lockin said operating member to said base, and elect-ro-magnetic means for controlling said latch and said dog actuator.

27. In an electric switch, the combination with a movable contact member, of an operating member therefor, an actuator, a thrust dog connect-ion for causing said operating member to move with said actuator, a dog actuator movable with said operating member and said actuator when 'they are connected a base, and means on said base foaiictuating said dog actuator to disconnect said actuator from said operating member, said operating member in its movement independent of said actuator raising said thrust dog against gravity.

28. In an electric switch, the combination with a base, of a' movable contact member, an operating member therefor, an actuator,

a dog on said actuator. thrusting against said operating member, a. dog actuating member u )on said operating member, a tail on said 0g actuating member, electro-re sponsive means, and a member on said base movable by said electro-responsive means into the path of travel of sa1d tail 29. In an electric switch,- the combination .with a movable contact member,'of an oper'-' ating member therefor, an actuator, a gravity controlled do 1 pivoted ()l'tSflld actuator and ada )ted to t rust against said'operats in mem er to move said Operating niember with said actuator-,1 said operatiiwia inember moving said dog against. 'ravityc uring-the openingmovement'ofsal sw tch. 30. In an electric switch, thecombmation with a movable contact member, of an.oper-- ating member therefor, an actuator, a-gravity controlled dog ti and adapted'to rustagain'st saidoperattwo subscribing pivoted on said actuator ing member to move said operating member with said actuator, said operating'mcmber moving said dog against gravity during the opening movement of said switch, and 'a stop for limiting the movement of saiddog by said operating member.

31. In an electric switch, the combination with a movable contact member, of an operating member therefor, an actuator, a gravity controlled dog pivoted on said actuator and ada )ted to thrust against said operating mom or. to move said operating member with said actuator, and means for actuating said dog to trip said switch, said operating member during the opening movement of said switch moving said dog againstgravity, sa'id dog adapted to be lowered by gravity upon niovementof said actuator indepcndently of said operating member to thrust against said operating member.

.32. In an electric switch, the combination with a movable contact member, of an operating member therefor, an actuator, a. gravity controlled dog ivoted on said actuator and adapted to t rust against said operating memberto move said operating member with said actuator, and.a dog actuating member carried by said operating member, said dog actuating member adapted tomove said dog against ravity during the opening movement of sai switch. a

33,111 an electric switch, the combination with amovable contact member, of an operating member therefor, an'actuator, a gravitycontrolled dogpivoted on said actuator and 'adapted to tirust against said operating member to move said operating meinber withsaid actuator, a dog actuating member carried by saidoperating member, said dog actuating inember adapted to move said :dog against gravity during-the opening movement of said switch, and a stop limitingsaid movement of said dog by said (leg actuating member.-- In'testimony whereof I have hereunto affixed --my signature in the presence of the witnesses. WILLIAM M. SCOTT. Witnesses ELsANoa- T. MoCALn, ANNA E. Srnmaoox. 

